Answer:
315 in²
Step-by-step explanation:
the surface area is the sum of the areas of all the individual shapes in the surface.
so, we have the 2 triangular bases and 3 rectangles as is sides.
the area of a rectangular triangle is a×b/2
we need them twice, so that is then a×b
a=4.5
b=6
a×b = 27 in²
one rectangle is 16×7.5 = 120 in²
one rectangle is 16×6 = 96 in²
one rectangle is 16×4.5 = 72 in²
total surface area is therefore
A = 27+120+96+72 = 315 in²
